[AMDGPU] Add an implicit use of M0 to all V_MOV_B32_indirect_read/write

NFCI. Previously the implicit use was added to V_MOV_B32_indirect_read
when building the instruction. V_MOV_B32_indirect_write didn't have an
implicit use of M0 at all, but apparently it did not cause any problems.

Differential Revision: https://reviews.llvm.org/D114239